Centrifugal pump.



No. 896,585. l PATENTED AUG. i8, 1908.

R. SALZER.

-GENTRIFUGAL PUMP.

@ ...mlf/ y un W WMM' G l W m i Il. .li -U WITNESSES:

BY ik ATTORNEY Lif).

site ends ol thc series of' impellers; in the pump, and to theconstruction of the pump,

" front head liaving the chamber 3, communi- .1h the dillfusers' of theremaining` impellers the rings are seated in recesses `between thenrnrnnsrairns Arana* nere.

RUDOLF Satzes, or resarcir, New JERSEY, AssreNon To THE DE LAVAL sTEAMTURBINE COMPANY.

onNfrRrrUGAL PUMP.

To all Lehel/L it may commet.'

Y le it known that l, it UeoLr SALZER, a subject oi the Emperor ofAustria-llungary, residing at 'l`ren'.n, n, in the county ol'v l\lercerand State ol' New Jersey, have invented a certain new and usei'ulimprovement in Centrifugal Pumps, of which thc following is aspecilication. v T he invention relates to multiple centrifugal pumps,and consists in the means for -quilibratingr liquid pressure exerted atoppo-V mcans for preventing entrance o1' air at the shaft journal on thedelivery side'of the all as more particularly pointed out in the claims.

in the accompanying drawings-,Figure 1 is a vertical axial section of mycentrifugal pump. Fig. 2 is an enlarged section showing in detail thefront balancing chamber.

Similar numbers of reference indicate like parts.

1 is the cylindrical pump casing. 2 the eating with the suction pipe' 4.The rear head 5 has an annular chamber 6 communicating with the deliverypassage 7. The casing and heads are horizontally divided in the usualway. On the shaft 7 are the impellers 9, 1D, 11 and 12, having the usualvanes 13. Surrounding each impeller is a diffuser formed of an annularplate 14 having lateral vanes 15 which venes carry a narrow ringY 1.6.1n the diffuser ol: iinpellcr 1 said ringl is seated in a recess betweenthe casing 1 and head 2.

casing and the internal partitions. In the dilusers of impellerslt) and11 the annular plate 1l1is eircurnferentially flanged, and. said flangeis received on a shoulder onl the periphery et the annular partitions17. ln theditluser ol impeller 12, the plate 14 has a flange which restson an inner partition wall the ringplate 14 and the other by a portionof the casing (head or partition as the case may bc) 'with the vanesextending in the usual way from wall to wall. Betwecnthe dii'luser ofeach impeller and the inlet of' the .next impeller in series is apassage formed by the partition 17, andA partition 19, said partitinnsbeing connected by the guide vanos Specification of -Letters atent.

Application filed April 7, 1906. Serial No. 310,457.

Patented Aug. 18, 1908.

20, which may be cast integrally with them. The partition 19 isconnected by a circu1nferential wall 21 to a parallel partition 22,which forms, already described, one wall ol' the dill'user associatedwith each of the impellers 10, 11, 12. The two partitions 19 and 22 withthe circumferential vali 21 vmay be integral and secured tothe casing 1,by screw bolts 23. On the outer periphery ol wall 21 is a tongue 24,which fits into a groove in the casing. v

Between the front head 2 and the Iirst impcller 9 of the series,isformed a chamber Surrounding said chamber is a loose ring 26, seatedin a recess in the head 2 vand having' flanges which alternate withsimilar' ilangeson the front side of the impeller 9. Another loose ring27 forms an inner circumferential boundary of chamber 25 and is seatedin said head 2, and provided with llanges which receive bctweenthem aflange on said impeller. The chamber 25 thus lies between the rings 26and 27. Between each of the partitions 19 and the successive impellersare flanged rings 28, similar to ring 27 these rings forming the jointbetween the impeller and the adjacent partition19.

Between the last impeller 12 and the rear head 5 is a chamber 29surrounded by a loose ring 30, which is seated in the head wall 18' andhas two flanges which receive between them a flange on the impeller 12.The inner circumferential periphery of chainber 29 is formed by anenlargement 31 of a bushing 32 'which extends over a shouldcr on the hubof impeller 12 and over a ixcd collar 33 onfhaft 8, against which collarsaid hub abuts: The bushing 32 extends through a bearing in the head 5and is received in a packing gland 34. Gutside of the ring and betweenthe impeller 12 and wall 1S is a clearance space 35. The chamber 29communicates with the front chamber 25 by means of a pipe 36, in whichis a valve 37.

The hub of impeller 9 has a sleeve rojection 3B which is seated in arecess in t ie hub of impeller 10, and-the hub of iinpeller 10 is seatedin that of impeller 11, and the hub Ao" impeller 11 in that of impeller12. ln this way' tight joints between the hubs are formed and the shaftprotected from 'corrosion. The front end of the hub of imneller 9 bearsagainst two half' rings 39 whic are placed in a groove on shaft S.Adjacent to shoulder in the hub of. impeller 9. Said bushing .42 extendsthrough a bearing in the head 2 and is received in a packing gland 43.

In the u per part of the casing are openings' 44, whic serve to admitpriming liquid to the several impellers. Several openings 45 serve todrain liquid from the apparatus when it is at rest. All of theseopenings may be internally threaded as shown to receive screw closing)lugs The object oft e chambers 25, 29 and connecting pipe 36 is tobalance the liquid pressure. on the faces of the impellers 9 and 12 atthe ends of the series. 'lhe pressure areas on the said impeller facesmay be directly proportioned with res )ect to thc relative pressuresexerted on tfiem, or, .preferably, approximately proportioned and animpeller outlet as herein described.

adjustment of relative, pressures effected by means of the valve 37. Thepressure exerted on op osite faces ol' the end impellers tends tov 'orcethe hubs together, thus pre-i venting leakage at the joints. Someleakage from chamber 25 into the chamber 3 and from chamber 2S) into theadjacent stulling box is lof course unavoidable; but the liruid soescaping from chamber 25 is replm-,edl by liquid from chamber 2)received through vthe pipe or transfer duct 36 whereby the pressure inchamber 29 is maintained at a lower pressure than in the clearance space35 and at the same pressure or nearly the same pressure (depending uponthe adjustment .of the valve 37) as the pressure in chamber 25 and -fromthis more or less coinlplete equalization of pressure in these two cambers, the balancingaction, which is the purpose of transfer duct 86,results. As the chamber 29 contains liquid under a pressure above thatof the atmosphere the eni trance of air to the pump around the shaftjournal at the delivery end is thus prevented. Such leakage as passesfrom said chami ber to the shaft journal assists in lubrication.

In another application for Letters Patent Serial No. 310,456, filedsimultaneously herewith, I have described and claimed the constructionof an annular chamber embodying two loose concentric rings seatedbetween the front side of the impeller andthe casing wall, and also theconstruction of the di`user formed by a substantially flat ring providedwith Vanes and a second ring vand seated in the annular passage beyondthe I have also described and claimed in said application, theconstruction of the shaft journals substantially as herein shown anddescribed. Said constructions are therefore not herein claimed.

I claim: i l

1. The combination in a multiple centrifugal pump, of a series ofimpellers and a casing therefor havin two liquid receiving chambers,whereof t e outer faces of the end impellers of the series form wallswith a duct connecting said chambers, and a valve in said duct.

2. The combination in a `multiple centrifugal pump, of a series ofimpellers and a casing therefor having (1) an annular chamberformedbetween the front side of the first impeller of the series and a casinwall and sur` roundingv the inlet of said impe ler, and (2) an annularchamber between the rear side 0f the last impeller of the series and acasing wall, with a duct connecting said annular chambers and a valve insaid duct.

.Si 'lhe combination in a multiple centrifugal pump, of a series ofimpellers and a casing therefor having (l) an vannular chamber formedbetween the front side of the 'iirst impeller of the series and a casingwall and surrounding the inlet of said impeller and (2) an annularchamber between the rear side of the last impeller and a casing wall, aiioating ring circumferentially bounding said last named chamber andforming a loose joint with said last impeller and said casing wall, aduct connecting said annular chambers and a valve in said duct. I

4. The combinatimi in a multiple centrifugal pump, of a series ofimpellers,`a shaft therefor, a casing having bearings foifsaid shaft and(1) an annular chamber formed between the front side of the firstimpeller of the series and a casin wall and surrounding the inlet ofsaid im e ler and (2) an annular chamber between t e rear side of thelast iinpeller and a casing wall, a ring circumferenof im ellers, and acasing therefor aving an annu ar chamber and a surrounding clearance sace both formed between the rear side of tiie last impeller of theseries and a easing head, a loose ring` forming a joint between saidclearance s ace and said chamber, and means for equalizing the liquidpressure in said chamber and the liquid pressure exerted on the outerface of the first impeller of said series.

6. The combination in a multiple centrifugal pump of a series ofimpellers, a casing, and a shaft for said impellers j ournaled therein;the said casing having an annular chamber surrounding the .shaft andformed between a casing wall and the rear face of the last impeller ofthe series, and the said chamber having loose joints in its inner andouter I circumferential walls whereby leakage from I the pump deliveryis permitted to pass' through said chamber to the shaft journal.

y 7. The combination in a multiple centrifugal pump of a shaft, a fixedcollar thereon, a series of impellers on said shaft, the hub of the lastimpeller of the series abutting against said collar and the hub of eachremaining iinpeller having a sleeve projection seated in a recess in thenext vadjacent impeller hub, two removable half-rings seated in a groovein said shaft in front ot the hub of the ir'st impeller ci the seriesand a holding ring surrounding said half-rings.

8. A centrifugal pump comprising in combination a series of rotaryimpellers, and a casing inclosing said impellers, having diffuserpassages for Athe several impellers 'receiving their discharge, saidcasing having passages connecting each diffuser passage except the lastto the intake of the next impeiler, and having chambers in which theimpellers revolve, said chambers each in iiuid connection with the spacebetween the periphery oi the corresponding im eller and the mouth of thecorresponding di vuser passage, and adapted to receive and be filled byi'iuid from such space, said casing having also a balancing chamber,between the last impeller and the head of the oasing,'which is inrestricted communication only with the chamber in which said lastimpeller revolves, and a transfer duct connecting said balancing chamberwith the s ace between the front side of the first impe er and thecasing, there being restricted waste from such spaces.

9. A centrifugal ump comprising in combination a series o rotaryimpellers, and a casing inclosing said impellers, having diffuserpassages for the several impellers receiving their discharge, saidcasing having passages connecting -each diffuser passage except the lastto the intake of the next irnpeller, and having chambers in which the1mpellers revolve, said chambers each 1n fluid connection with the spacebetween the periphery of the corresponding impeller and the mouth of thecorresponding diffuser passage, and ada ted to receive and be vfilled byfluid from suc space, said casing having also a balancing chamber,between the last impeller and the head of the casing, which is invrestricted communication only with the chamber in which said lastimpeller revolves, anda transfer duct connecting said balancing chamberwith the s ace between the front side of the first iinpel er and thecasing, there being restricted waste from such space, said transfer ductprovidedwith regulating means. In testimony whereof I have ailixed mysignature in presence of two witnesses.

RUDOLF SALZER.

Witnesses:

' WM. H. SIEGMAN,

PARK BENJAMIN, Jr.

